Jeak pieeee alexandee scola



(No Model.)

Patented Aug. 10, 1886.

-have invented a new and useful Electric Light-' 'ing-Fuse for BlastingPurposes, of which the b, embraced longitudinally by the conductingtien.

.'Fig; 5 a longitudinal elevation, of the lighter.

.groove c. .The two wires may be placed close -as shown.

-of fulminate being'lled into the space f at naked ends of the wires.The electric spark vNi'rED STATESf ELECTRIC Fuss Fon BLAS-rino.

PCIFlCATIO'N forming 'part 'ox' Letters Patent No. 347,013l dated August10, 15386A Applicatgnled March 27, 1856.

ali whom, it may-concern: .Be vit known that I, JEAN PIERRE ALEX- EDRESCOLA, of the city of Paris, France,

following is a full, clear, 'andexact descrip- This 'invention relatesto electric lightingfuses or lighters for use in blasting by meansef'gunpowder or dynamite in 'mines generally, but more especiallyincoal-mines liable to the presence of fire-damp. These lighters entirelyobviatc the\ use of fuses of all kinds which require to be ignited by aflame. ,They' are also more economical, and a great saving of time iseected, especially in thecase of Vmis-lires, as the lighter can beimmediately replaced withoutthe liability of accidents, such as areordinarily caused in drawing the charges, which can only be done afteran interval .of twenty-four hours. Moreover, 'as several shots can bered instantaneously, no loss of time' is incurred by the workmen.'-Reference is to be had to the accompanying drawings, formingpart ofthis specification, which illustrate an example or" the invention. I

`Figure l represents the plug used with the lighter of thisinvention,with the conductingwires attached. Fig. 2 is a plan of thesame, andFig. 3 a horizontal section on line 1 2 of Fig.'1. Fig. a is alongitudinal section, and

Thesame letters of reference represent the Same parts in allthe figures."-lhe lighter is composed of a grooved plug,

wires d, -which are first twisted together at the inner end of the plugand then laid in the to o'ne another at the outerv end of the plug, Thewire at the inner end of the plug is then naked,l so as to leave thetwoends exposed, which are then flattened' down. The plug is inclosed ina paper sheath, e, a charge the closed end of the sheath inclosing theproduced on the passage of the current between the naked ends of thewires ignites the fulminate. The electric lighter is introduced into atube, a, of copper or pasteboard,.pro

senti NDL 196,154. (No moan vided with a quick-match, g, which isignited and projected bythe fulminate into the hole and fires the chargeof .powder placed therein.

For firing dynamite, the lighter is modified as follows: The pasteboardtube is dispensed with and the. plug is introduced into an ordinarydetonating capsule containing` a fulminate. The electric lighter'isseparated from thefulminate by a space of from four to six millimeters,so as to avoid accident caused by friction or otherwise. The capsulethus prepared is inserted in the charge in the ordinary way, theadditional advantage. however. being obtained of freedom from liabilityof iguiting the priming f, which is the cause ofso much loss of time andmateriabas'well as of danger when drawing mis-lires. The electricpriming will, in fact, either instantaneously produce an explosion ornot at all,an d there will be no risk attending the immediate renewal ofthe priming or withdrawal of the Y charge.- y y Any kind of electricalapparatus ,may be employed for exploding these lighters; but it' ispreferred to use those by means o'f which several shots, either ofpowder or dynamite,

may be iired simultaneously.

It will be evident that the herein-described arrangements may be appliedfor producing the ignition of a Bickford fuse, which would in-this casebe substituted for the quick-match g in tube a'thereby avoiding the useof a naked flame.

I claim-v A i An electric lighting-fuse or lighter for blastingpurposes, consisting inthe combination of the guide-tube a' with thevgrooved wooden plug b, the conducting-wires d, the fulminate f, abovesaid plug, the paper, or other sheath or cap c, and quick-match g, thesheath or cap e, containing the plug b, the wires d,.and the fulminatef,andbeing itself contained within JEAN PIERRE ALEXANDRE-SOMA.

Witnesses: l i ROBEM. HoorER, ALBERT MOREAUX.

